alchemy: essence (essentia)

absolute aetheroleum alchemy alchymia balsam being book chemicals chemistry chrysopoeia concrete content core elixir essence essentia essential ethereal extract feature formula fundamental gist grimoire heart herbs hermetic iatrochemie kabbalistic knowledge laboratory lapis life magic materia medieval mystery mystic occult oils philosophers philosophorum prima quintessence sign spagyric spirit stone substance symbol synthesis tetrasomata transmutation vector volatile witchcraft zauberbuch